16-50 took a second of thinking before sdm moved after being taken out from +20°C into -13°C and seemed a wee wee wee bit slow after that, sort of "driver's butt slow" if you know what I mean, i.e. not discernible to anyone else. it did the same once after that without a huge temperature drop so while my feeling attributes it to rapid cooling of the outside of the lens, it may have also been just a sign of SDM being on the way out yet again hth ecke
2010/4/14 Jack Davis <jdavi...@yahoo.com>: > Something I've been meaning to ask about. Has anyone had the experience of > shooting with an SDM lens, fresh out of the bag from a warm car and into > early morning air chilly enough to produce visible breath fog. > This happened one morning while at the coast DA* 50~135). AF felt as though > it were operating in at least cool molasses. I was attempting to track some > birds in flight and had to pick them up early and try holding focus awaiting > the shutter. > Later in the day, I took it out into the warming sun for a few minutes and > tried it again. This time it seemed to be normally quick in response. > I was relieved, but made me wonder if it's starting to wimp out. K20D battery > appeared to be fully charged. > Any such experiences? > > Thanks! > > Jack > > > > > -- > PDML Pentax-Discuss Mail List > PDML@pdml.net > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and follow > the directions. > -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
